Mounting for rock drills



Oct. 26, 1954 P. A. LINCOLN MOUNTING FOR ROCK DRILLS Filed July 29, 1950 2 Sheets-Sheet l INVENTUR YPAUL A. LINCOLN ms ATTORNEY Oct. 26, 1954 p LINCOLN 2,692,756

MOUNTING FOR ROCK DRILLS Filed July 29, 1950 2 Sheets-Sheet 2 INVENTO PAUL A. LING HIS ATTORNEY Patented Oct. 26, 1954 UNITED STATES OFFICE MOUNTING FOR ROCK DRILLS Application July 29, 1950, Serial No. 176,589

(ill. 255-51) 3 Claims.

This invention relates to rock drilling mechanisms, and more particularly to a mounting for rock drills of the drifter type which are usually mounted upon and supported by a column or bar and actuated relatively thereto by suitable mechanism for feeding the drill steel into the rock and for extracting it from the drill hole.

One object of the invention is to facilitate the operation of changing drill steels.

A more specific object is to enable the rock drill to be readily moved out of drilling position in order to expedite the operation of changing drill steels and to again return it quickly to the correct operative relationship with the drill steel without requiring the tedious and time consum- ,1,"

ing operations of manipulating and adjusting the devices serving to secure the rock drill to its support.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawings accompanying this specification and in which similar reference numerals refer to similar parts,

Figure 1 is a longitudinal side view of a rock drill of the drifter type and its guide shell equipped with a mounting constructed in accordance with the practice of the invention,

Figure 2 is a rear end view of the mechanism shown in Figure 1,

Figure 3 is a transverse view taken on the line 3-3 of Figure 2,

Figures 4, 5 and 6 are perspective views of details of the invention,

Figure 7 is a view similar to Figure 1 showing a modified form of the invention,

Figure 8 is an end View of the form of the invention shown in Figure 7,

Figure 9 is a transverse view taken through Figure 8 on the line 9-9, and

Figures 10 and 11 are perspective views of details of the modified form of the invention.

Referring more particularly to the drawings, the invention is shown applied to rock drilling mechanism designated, in general, by '26 and comprising a rock drill 21 of the drifter type slidable in a shell 22 which has the usual internal guideways 23 for the accommodation of ribs 24 on the rock drill 2|.

The rock drill 2| is actuated longitudinally of the shell 22, in a well known manner, by a feed screw 25 and the assembly is shown supported by an arm 26 which may be an extension of a drill column (not shown). The means serving to secure the rock drill and the shell upon the arm 26 is in the form of a clamping device 21 which may be of a well known type consisting of upper and lower clampingplates 2B and 29, respectively, shaped interiorly to conform with the surface of the arm 26.

The plates 28 and '29 are connected to each other at one end by a pivot pin 38 and the plate 28 has pivotally connected to its other end an eye-bolt 31 which lies within a slot 32 in the adjacent end of the plate 28 and carries a nut 33 that acts against the plate 29 for clamping the plates to the arm 26.

The top of the plate 28 is in the form ofa seating surface 34 and adjacent said seating surface and integral with the plate it is a lug 35 that partly encircles and overlies the surface 34 for engagement with a coniform flange 36 which rests upon the seating surface M and constitutes an integral part of a base member 37. The base member 3'! is clamped securely against the seating surface 34 and against the inner surface of the lug 35 by a jaw 38 mounted upon a bolt 39 carried by the plate 28. The bolt 39 occupies a position normal to the longitudinal axis of the base member 31 and diametrically opposite the lug 35 and is provided with a nut in that acts against the jaw 38 to press one end thereof against the periphery of the plate 28 and the other end against the coniform' surface of the flange 36.

The base member 31 is positioned between the clamping plate 28 and the guide shell 22 which, in accordance with the practice of the invention, is mounted upon the base member for rocking movement with respect thereto suchwise that the rock drill 2| may be rocked laterally of the axial plane of the drill steel 4 l which it actuates. To this end a pivot, in the form of a bolt 42, is disposed transversely through the base member 31, in parallelism with the axis of the rock drill, and through lugs 43 depending from a bearing member is for the guide shell 22.

The guide shell '22 rests upon a seat 45 on the upper surface of the bearing member 44 and is preferably slidable endwise thereon in order that the shell may be moved toward or away from the working surface, if desired. The guide shell is clamped to the bearing member 64 for holding it fixedly during the operation of the rock drill and is accordingly provided with a depending rib 46 having bevelled surfaces 4'! extending along the sides thereof, one of which seats against a correspondingly shaped surface 48 of a lug 49 integral with the bearing member 44. The other bevelled surface 41 cooperates, in like manner, with a surface 5!] of a clamping member 5| positioned on the side of the bearing member opposite the lug 49. The clamping member 5| is disposed upon a bolt 52 extending transversely through the bearing member 44 and having a nut 53 whereby the one end of the clamping member is pressed against the adjacent surface 41 and the other end is pressed against the body of the bearing member.

In order to limit the range of rocking movement of the rock drill 2|, together with the guide shell 22 and the bearing member 44 with respect to the base member 3'! to inclined positions on the opposite sides of the axial plane of the base member, the said base member is provided on the opposite sides of the bolt 42 with seating surfaces 54 that slope downwardly toward the periphery of the base member for cooperation with seating surfaces 55 on the under side of the bearing member 44. The extent of such movement of the rock drill is determined by the degree of inclination of the seating surfaces 54 which lie on opposite sides of the bolt 42 and are radial thereto. The seating surfaces 55, on the other hand, are both preferably positioned in a plane that extends through the axis of the bolt 42.

Means are provided for holding the rock drill against unauthorized movement about the bolt 42 so that one or the other of the seating surfaces 55 will remain seated upon a surface 54 unefiected by the vibrations and jars incident to the operation of the rock drill. pair of friction members 56, in the form of sleeves, are disposed upon the bolt 42, at diametrically opposed points on the base member 31 and are freely slidable on the bolt. Each friction member carries a key 51 that is slidable in a slot 58 in the lugs 43, and the inner ends 59 of the friction members 56 are of coniform shape which extend into correspondingly shaped recesses 65 L in the base member 31 and frictionally engage the walls of said recesses for preventing free tilting movement of the rock drill about the bolt 42.

The degree of pressure with which the coniform ends of the friction members engage the walls of the recesses 60 is determined by a spring 6! which encircles the bolt 42 and acts at one end against the adjacent friction member and at its other end against a nut 62 threaded onto the bolt for varying the force of the spring 6|. Such force is applied to the friction member 56 by the head 63 of the bolt 42.

In the operation of the device, and at the beginning of a drilling period, the rock drill is tilted to one side or the other of the axial plane of the base member 31 to a position wherein a seating surface 55 rests upon a seating surface 54, as in the manner shown in Figure 2, for example. The rock drill will be held in this position by its own weight and by the friction members 56 and the cooperating surfaces of the recesseses 60. The percussive element of the rock drill is then set in operation and after the drill steel 4| has penetratedthe rock to the limit of its extent the rock drill is retracted on the guide shell 22 to disconnect it from the drill steel and is then tilted about the bolt 42 to a position wherein the opposite hand seating surface 55 rests upon the adjacent seating surface 54. In this manner the rock drill will be moved out of alignment with the drill steel so that the latter may be conveniently withdrawn from the drill hole and another of greater length placed into the hole. The rock drill is then swung to its original position and again advanced along the guide shell To this end a- '22 for connection with the drill steel preparatory to another step of drilling operation.

These periods of operation and substitutions of drill steels may be repeated until a hole of the desired depth has been drilled and, as will be readily appreciated, each change of drill steel may be conveniently effected by merely tilting the rock drill out of the plane of the drill hole for removing the drill steel and back again to its original position where it will be in exact alignment with the newly inserted steel. All of these changes in the position of the rock drill with respect to the drill hole can, moreover, be made without requiring the manipulation of any of the devices, such as the clamping members of the assembly, that serve to hold the rock drill and its adjuncts in the correct operative relationship with the work.

In the form of the invention shown in Figures 7 to 11 inclusive, the base member which supports the rock drill and its adjuncts is in the form of a bar 54 having an end 65 of coniform shape that is in frictional engagement with the internal surface 66 of similar shape of a cup-like member 61 on the end of an arm 58 and which may be a part of or suitably secured to a drill column, or quarry bar (not shown). The bar 64 is held in frictional engagement with the member 51 by a bolt 69 in the bar 64 extending through the member 61 and carrying a nut H; which seats against the outer end of the member 6'5.

In this form of the invention, the guide shell 22 supporting the rock drill is clamped directly to the base member, or bar, 64 which lies in parallelism with the rock drill and has a lug, or lugs, H to overlie the bevelled surface 12 of an annular flange 13 at the free end of an extension 14 depending from the guide shell 22. The annular flange '13 is seated upon a surface 15 on the bar 64 and is clamped thereagainst and against the lug, or lugs, H by a pawl it which seats at one end against the bevelled surface 12 and is pivotally attached at its other end, by a pin 11, to a lug, or lugs, 18 depending from the bar 64. The pawl is pressed against the flange 13 by a nut 19 threaded onto a bolt at the end of the bar 64.

The means serving to limit the range of movement through which the rock drill may be tilted for positioning it abaxially with respect to the hole being drilled are carried by the member Bi and the bar 64. They are in the form of lugs, two of which are designated 8: and 82, and positioned on the portion of the bar 64 adjacent the conically shaped end 55 and another lug 83 is on the periphery of the member 61 and extends beyond the open end 84 thereof into the same transverse plane as the lugs 8! and 82.

The lugs 8| and 82 are angularly so spaced with respect to each other that they will permit the rock drill 2! to be swung about the conical end 55 from a drilling position in which it inclines from the vertical plane of the bar 54, and wherein the inner surface 85 of the lug 82 engages the opposed surface 86 of the lug 83, to the opposite hand position in which the inner surface 8'1 of the lug 8| will bear against the opposed surface 88 of the lug 83.

In this latter position, the rock drill will lie alongside of the path of movement of the drill steels and will be effectively held in that position by the conical surfaces of the bar 64 and the member 61. The degree of frictional contact between these surfaces may be conveniently controlled by manipulation of the nut it which may, moreover, serve to clamp the member 61 immovably to the conical end 65, if desired.

As will be readily apparent from the foregoing description, in this form of the invention the rock drill may also be conveniently and quickly swung out of alignment with the drill hole to a position inclined from the vertical plane of the base member or bar 64 and will be retained thus by its own weight to permit of the safe and expeditious changing of drill steels and may be again returned to precise axial alignment with the drill steel Without necessitating the manipulation of a plurality of clamping devices and the serious loss of time usually required to restore the rock drill to the correct drilling position.

I claim:

1. A mounting, comprising in combination with a rock drill and a guide shell therefor, a base member, a bearing member for the guide shell, a pivot for pivotally connecting the bearing member to the base member positioned to enable the rock drill to rock laterally of a hole being drilled by the rock drill, a friction member slidable axially on the pivot relatively to both members and interlocked with the bearing member for movement therewith about the pivot and being in frictional engagement with the base member, and a spring for holding the friction member yieldingly against the base member.

2. A mounting, comprising in combination with a rock drill and a guide shell therefor, a bearing member, a base member for the guide shell having diametrically opposed recesses of coniform shape therein, a pivot in the bearing and base members extending through the recesses, friction members slidable on the pivot with respect to both members and being slidably interlocked with the bearing member and having coniform portions extending into the recesses, a spring on the pivot for pressing the coniform portions into frictional engagement with the walls of the recesses, and means for varying the force of the spring.

3. A mounting, comprising in combination with a rock drill and a guide shell therefor, a base member, a bearing member for the guide shell, a pivot lying in parallelism with the axis of the rock drill for pivotally connecting the members together to permit of the manual rocking of the rock drill with respect to the base member, stop means on the members at opposite sides of the pivot cooperating with each other to hold the rock drill in positions inclined from a horizontal plane extending through the pivot, a friction element slidable on the pivot to frictionally engage the base member for resisting free rocking movement of the bearing member on the pivot and being slidably interlocked with the bearing member, and a spring for pressing the friction element into frictional engagement with the base member.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 540,764 Spring June 11, 1895 812,774 Smith Feb. 13, 1906 929,826 Brothers Aug. 3, 1909 1,024,574 Herstad Apr. 30, 1912 1,132,348 Hunter Mar. 16, 1915 2,598,112 Curtis May 27, 1952 FOREIGN PATENTS Number Country Date 606,885 France June 22, 1926 

